65results about How to "Reduce clamping effect" patented technology

A fastener (1) includes a screw (2) and a supporting element (3). The screw (2) includes a head (4), a shank (8) and a threaded portion (12). The threaded portion (12) is located on the shank (8). The threaded portion (12) includes a thread having an outer diameter (14). The threaded portion (12) includes a thread runout (25) facing the head (4) of the screw (2). The shank (8) includes a shank portion (10) having a diameter (11) which is smaller than the outer diameter (14) of the thread. The supporting element (3) is captively connected to the screw (2), and it includes at least one narrow location (27). The narrow location (27) has a diameter (28) which is smaller than the outer diameter (14) of the thread. The narrow location (27) includes at least one surface element (30, 35) facing the thread runout (25) and forming an enveloping cone (31) enveloping the thread runout (25) to prevent the supporting element (3) from getting clamped at the thread runout (25) of the screw (2).

An in-line pipe inspection tool has one or more inspection platforms (28, 30) which are connected to an elongate wheeled trolley by link arms (20 to 26). The trolley unit (10, 12) has drive means for driving the point of connection of the first link arm (20, 22) to the trolley (10) relative to the point of connection of the second link arm (24, 26) to the trolley (12), thereby to move the inspection platforms (28, 30) in a direction perpendicular to the direction of elongation of the trolley (10, 12). Thus the inspection platforms (28, 30) are movable which is relative to the trolley (10, 12) to permit the tool to be adapted to pipelines of different diameters. Moreover, the platforms (28, 30) preferably have permanent magnets which contain a rotatable magnet. The rotatable magnet permits the net magnetic field generated by the platform to be varied.

The invention discloses a diagonal ore-break-down medium-length hole mining method for a steeply-inclined thin vein ore body. The method comprises the following steps: arranging a stope according to the strike of the ore body, dividing rooms, pillars and sections according to the inclination direction of the ore body and arranging a level haulage roadway along the vein of the ore body from the footwall of the ore body; driving ore-drawing crosscuts into the ore body from where the level haulage roadway is located; horizontally arranging an undercutting roadway along the vein and parallely driving rock-drilling prospecting rises along slant height; arranging ore drop shafts to abut against the haulage roadway; starting stoping from one side of the stope, stopping stoping when the undercutting roadway is driven to the position of the first rock-drilling prospecting rise and then driving the rock-drilling prospecting rise; allowing a medium-length hole drilling machine to gradually travels from undercutting roadway to rock-drilling prospecting rise, drilling medium-length upward blast hole, carrying out denotation and drawing ore out from the bottom ore-drawing crosscuts; and after the first rock-drilling prospecting rise reaches a certain position, continuing driving the undercutting roadway until the position of the second rock-drilling prospecting rise is arrived at, carrying out medium-length hole mining, and repeating the above-mentioned operations until stoping of the stope is completed. The diagonal ore-break-down medium-length hole mining method has the advantages of high production efficiency, great production capacity and good operation security.

A filtering face-piece respirator 10 that comprises a harness 14 and a mask body 12. The mask body 16 includes a filtering structure 18 and a support structure 16. The support structure 16 has first and second opposing side portions 22, 24 that each include a living hinge 44. The use of living hinges allows the mask body to respond dynamically to wearer jaw movement.

The invention discloses a method for preparing and transferring a multilayer barium titanate and multilayer cobalt ferrite magnetoelectric composite film. The problems that the substrate clamping effect and electric leakage cannot be simultaneously reduced by the composite material of the conventional structures 1-3 are mainly solved. The method comprises the following implementation steps: depositing a magnesium oxide film on a sapphire substrate, and alternatively depositing a multilayer cobalt ferrite film and a multilayer barium titanate film on the substrate; spinning polymethyl methacrylate on the surface of the final barium titanate film, and removing a single crystal magnesium oxide film by using an ammonium sulfate solution, so that the magnetoelectric composite film attached to polymethyl methacrylate is separated from the sapphire substrate; and transferring the magnetoelectric composite film separated from the sapphire substrate onto a subsequent needed substrate, thereby obtaining a self-supported magnetoelectric film compounded by the multilayer cobalt ferrite film and the multilayer barium titanate film. The multilayer barium titanate and multilayer cobalt ferrite composite film disclosed by the invention is large in surface coupling property, the magnetic and electrical properties are enhanced, the substrate clamping and electric leakage problems are reduced, and the method can be used for preparing a magnetoelectric sensor.

The invention provides a strip mine trenching method. The method comprises the following steps: dividing steps of a strip mine into a higher slice and a lower slice; tunneling a higher slice main access and a higher slice pioneer cut to carry out a higher slice expanding operation; tunneling a lower slice main access and a lower slice pioneer cut to carry out a lower slice expanding operation, andcarrying out a higher slice stripping operation at the same time; carrying out the higher slice stripping operation and a lower slice stripping operation at the same time; and combining the higher slice with the lower slice to form a complete step main access and a step work line. Through the technical scheme of the method, the trenching operation is implemented in two stages, so that the trenching work account is reduced by 20-40% and the new level preparation time is decreased; in the new level preparation process, a work surface can be formed to implement the stripping operation, so that the convention of carrying out trenching, expanding and stripping in sequence is broken through, a multi-work surface operation can be formed as soon as possible at the initial stages of mines, the mines can reach design capacities as soon as possible, and the stable yield time of the mines can be prolonged to avoid reduction of output untimely.

The invention discloses a manufacturing method of a flexible magnetic field strength sensor based on a magnetoelectric composite film. The problem that the existing magnetic field strength sensor haslow sensitivity and cannot be bent is solved. According to the implementation scheme, 1 a lanthanum strontium manganese oxide film is deposited on a strontium titanate substrate, and cobalt ferrite and a barium titanate film are successively deposited on the lanthanum strontium manganese oxide film to acquire a multilayer magnetoelectric composite film; 2 polymethyl methacrylate is spin-coated, and the lanthanum strontium manganese oxide film is removed with a potassium iodide solution; 3 the off-substrate magnetoelectric composite film is transferred to a subsequent needed flexible substrate;and 4 electrodes are added to left and right sides of the surface of the magnetoelectric composite film to complete the manufacturing of the magnetic field strength sensor. According to the invention, the magnetoelectric composite film is used as a sensing material, so that the sensor can be bent; the magnetoelectric characteristic of the bent film is remarkably enhanced; the sensitivity of the magnetic sensor is improved; the requirement of a flexible electronic device is satisfied; and the method can be used to prepare a semiconductor device.

The embodiment of the invention relates to the technical field of coal mining engineering, in particular to a deep-hole coal blasting method for a manless working face of a steeply dipping coal seam.The deep-hole coal blasting method comprises the steps: at the positions of solid coal walls of an upper-zone roadway and a lower-zone roadway at the depth away from a coal working face by single-timeblasting cyclical footage, a plurality of blast holes with predetermined depths are drilled obliquely inwards from the coal walls, wherein the multiple blast holes are consistent with the dip angle of the coal seam; after drilling is completed, casings are sent into drill holes within the predetermined time; according to the pre-calculated single-hole explosive load and a determined explosive loading mode, explosive coils are loaded into predetermined positions of the blast holes, explosion propagation lines are led out to be connected to an initiation point, and the blast holes are blocked through blocking gun clay; and an initiator is started, the explosive coils in the multiple blast holes are initiated simultaneously, and coal bodies at the single-time blasting cyclical footage depthare guided to move to be broken through a plurality of blasting free faces to achieve coal dropping. The deep-hole coal blasting method can be suitable for mining the steeply dipping coal seam and provides a comprehensive theory and a practical guiding basis for later production and mining of the steeply dipping coal seam.

The invention discloses a piezoelectric plane horn, comprising a framework, a piezoelectric actuator, and a vibration generating membrane arranged in the transparent assembling space of the framework, wherein two opposite sides of the vibration generating membrane are fixed to the piezoelectric actuator, with the other two sides thereof forming a spacing relationship with the framework; the piezoelectric actuator formed by utilizing a bimodal piezoelectric piece is fixed at two sides of the vibration generating membrane; the vibration generating membrane is made to generate the voice of high pitch voltage via the high deformation of a bimodal piezoelectric piece; the bimodal piezoelectric piece in the piezoelectric actuator can be independently driven by the drive circuit to cooperate with the phase control of different bimodal piezoelectric piece drive voltage, thus to adjust the vibration movement of the vibration generating membrane and reduce the resonance phenomenon of the vibration generating membrane, thereby making the vibration generating membrane produce relatively flat acoustic frequency response. The piezoelectric plane horn is applicable to sound equipment, TV, computer, and other electronic devices and is located in a preset installing space of the electronic device by utilizing the framework thereof.

A system and method provides a piezoelectric stack arrangement for reduced driving voltage while maintaining a driving level for active piezoelectric materials. A stack arrangement of d₃₆ shear mode <011>single crystals of both air X-cut and Y-cut ±1:45° (±20°) arrangement are bonded with discrete conductive pillars to form a shear crystal stack. The bonding area between the neighboring crystal parts is minimized. The bonding pillars are positioned at less than a total surface are of the single crystal forming the stack. The stack fabrication is facilitated with a precision assembly system, where crystal parts are placed to desired locations on an assembly fixture for alignment following the preset operation steps. With the reduced clamping effect from bonding due to lower surface coverage of the discrete conductive pillars, such a piezoelectric d₃₆ shear crystal stack exhibits a reduced driving voltage while maintaining a driving level and substantial and surprisingly improved performance.

The invention discloses a large-section-height multi-row micro-difference extrusion blasting method. A vertical deep hole is adopted as a blast hole, hole distribution is conducted according to the principle that explosive is evenly distributed in a to-be-blasted rock body, and the hole distribution manner is a rectangular hole distribution manner. Through determination on blasting parameters, anexplosive filling structure is designed, the multi-hole rowed hole distribution manner is selected on the vertical plane, a deflection center point is selected as a blasting point, and micro-difference sequential blasting is adopted between the adjacent holes and is adopted in holes between rows. The large-section-height multi-row micro-difference extrusion blasting method has the beneficial effects that a favorable free face is created for subsequent ore body rock blasting, and the rock clamping action is lowered; in the rock block motion process after rock body crushing, rock blocks are mutually in collision, mutual rubbing happens, impact pressure and shearing force are generated, the rock blocks are crushed again, a rock block diameter reducing blasting method is provided, the blastedrock body crushing degree can be improved, the blasting vibration effect is reduced, harm to ground buildings is lowered, and mine safety is maintained.

The invention relates to the field of welding, in particular to a 300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool and a use method. The 300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool and the use method aim at solving the problems that a hula seal molded line and radian are changed due to the fact that the unrestrained end of a 300MWheavy-duty gas turbine nozzle hula seal is deformed to release welding tensile stress, and the follow-up assembly is influenced. The 300MW heavy-duty gas turbine nozzle hula seal assembly welding restraining tool is designed and manufactured and comprises a restraining force application part and a restraining belt, wherein the restraining belt is annular when working, one end of the restraining belt is connected with the restraining force application part, the other end of the restraining belt is tightened through the restraining force application part, the hula seal is forcibly restrained byusing the restraining tool all the time in the high-temperature alloy hula seal and nozzle assembling and welding process, the temperature difference of different positions disappears after welding iscompleted, after a certain welding stress is released, the restraining tool is removed, it is guaranteed that the free end of the hula seal does not have larger free deformation, it is further guaranteed that the molded line and radian of a product meet drawing and design requirements, and the subsequent combustion chamber assembling requirement is met.

The invention relates to a controlled blasting construction method of a beam nest on a vertical shaft wall. The method comprises the following steps that the beam nest outline boundary is determined on the vertical shaft wall; a set of corner blasthole is arranged and constructed in each corner of the beam nest according to the beam nest outline boundary, a central blasthole is arranged and constructed in the center of the beam nest, and at least one set of auxiliary blasthole is arranged and constructed between each corner blasthole and the central blasthole; 90-degree kerf explosive tubes are arranged in all the corner blastholes, and a first-section explosive and second-section explosives are arranged in the central blasthole and the auxiliary blastholes; and detonating is carried out according to the detonating sequence of corner blasthole explosives, central blasthole top explosives, auxiliary blasthole top explosives, central blasthole bottom explosives and auxiliary blasthole bottom explosives to finish controlled blasting construction of the beam nest. According to the method, 90-degree kerf explosive bags are arranged in the corner blastholes of peripheral holes of the beam nest to form vibration isolation pre-cracks, and a staged and sectioned blasting manner is adopted in a main blasting area, so that safe and efficient controlled blasting of the beam nest on the vertical shaft wall is realized.

A piezoelectric multilayer component includes a stack of piezoceramic layers and electrode layers arranged one above another. At least one piezoceramic layer is printed with a layer structured according to a predefined pattern in a piezoelectrically inactive zone of the stack. The structured layer has at least one connecting element by which piezoceramic layers that are adjacent in the stacking direction are mechanically connected to one another with a first strength. The structured layer has interspaces filled at least in part with piezoceramic material of the adjacent piezoceramic layers. The adjacent piezoceramic layers in the interspaces are mechanically connected to one another with a second strength, which is less than the first strength.